VulnerabilityModified
CVE-2016-9073
WebExtensions can bypass security checks to load privileged URLs and potentially escape the WebExtension sandbox.
HIGH 7.5EPSS 1.60%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.60%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
WebExtensions can bypass security checks to load privileged URLs and potentially escape the WebExtension sandbox. This vulnerability affects Firefox < 50.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 1.60% probability · 76th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-264
- Affected
- mozilla/firefox
- Source
- security@mozilla.org
EPSS 1.6% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/94337Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037298Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1289273Issue Tracking, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2016-89/Vendor Advisory
- http://www.securityfocus.com/bid/94337Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037298Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1289273Issue Tracking, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2016-89/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.